# How to define Missing Invariant Mass within madanalysis

How to define Missing Invariant Mass within madanalysis?

We are using Type-III seesaw model, we want to get a distribution of Missing Invariant Mass (MIM). We do not see the inbult set of variables for the MIM in the plot card. How do we define this?

## Question information

- Language:
- English Edit question

- Status:
- Open

- Assignee:
- Rikkert Frederix Edit question

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- Last reply:

Rikkert Frederix (frederix) said : | #1 |

You can use the placeholders X1(p1), XY1(p1,p2), etc. to define the MIM.

Best regards,

Rikkert

Can you please describe it in a more descriptive way, I am not able to define the MIM for SM neutrinos.

Rikkert Frederix (frederix) said : | #3 |

Assuming that your process has exactly 2 neutrinos in the final state (and that you are using LHE level plotting and not LHCO), you define the function XY1(p1,p2) to be the computation of the MIM of these particles,

XY1=sqrt( (p1(0)+p2(0))**2 - (p1(1)+p2(1))**2 - (p1(2)+p2(2))**2 - (p1(3)+p2(3))**2 )

(please double check this formula; I might have made a typo). Then, in the plot_card, add the neutrinos to a new class and specify that you want to plot XY1 for the first 2 particles in this new class, as you would do for any other plot.

Let me know if this helps.

best,

Rikkert

Hi,

Thank you very much for your nice explanation.

I have a doubt that should I define this function of XY1 in kin_functions.f?

What about the function if I have anti neutrinos along with neutrinos in

the final state?

Regards,

Deepanjali

> Question #280514 on MadGraph5_aMC@NLO changed:

> https:/

>

> Rikkert Frederix proposed the following answer:

> Assuming that your process has exactly 2 neutrinos in the final state

> (and that you are using LHE level plotting and not LHCO), you define the

> function XY1(p1,p2) to be the computation of the MIM of these particles,

>

> XY1=sqrt( (p1(0)+p2(0))**2 - (p1(1)+p2(1))**2 - (p1(2)+p2(2))**2 -

> (p1(3)+p2(3))**2 )

>

> (please double check this formula; I might have made a typo). Then, in

> the plot_card, add the neutrinos to a new class and specify that you

> want to plot XY1 for the first 2 particles in this new class, as you

> would do for any other plot.

>

> Let me know if this helps.

>

> best,

> Rikkert

>

> --

> You received this question notification because you are subscribed to

> the question.

>

Rikkert Frederix (frederix) said : | #5 |

Hello Deepanjali,

XY1 should be defined in kin_functions.f. The placeholder is there.

Anti-neutrinos can be treated in the same way is the neutrinos by adding them to the same class.

Best,

Rikkert

Hi,

I defined the variable for MIM as given below in kin_function.f,

DOUBLE PRECISION FUNCTION XY1(P1,P2)

c******

c Missing Invariant Mass of two particles.

c******

IMPLICIT NONE

c

c Arguments

c

double precision p1(0:3),p2(0:3), dsign

c-----

c Begin Code

c-----

XY1 = sqrt((p1(

>(

RETURN

END

_______

After compiling it in plot card , its giving error like this,

compile Source Directory

Error detected in "generate_events "

write debug file

/home/deepanjal

If you need help with this issue please contact us on

https:/

MadGraph5Error : A compilation Error occurs when trying to compile

/home/deepanjal

The compilation fails with the following output message:

gfortran -O -w -fbounds-check -fPIC -ffixed-

kin_functions.o kin_functions.f

gfortran -O -w -fbounds-check -fPIC -ffixed-

setrun.o setrun.f

cd PDF; make

cd MODEL; make

make[1]: Entering directory

`/home/

make[1]: warning: jobserver unavailable: using -j1. Add `+' to

parent make rule.

make[1]: Entering directory

`/home/

make[1]: warning: jobserver unavailable: using -j1. Add `+' to

parent make rule.

ar cru ../../lib/libpdf.a Ctq4Fn.o Ctq5Par.o Ctq5Pdf.o Partonx5.o

Ctq6Pdf.o cteq3.o mrs98.o mrs98lo.o mrs98ht.o mrs99.o mrst2001.o

mrst2002.o jeppe02.o pdfwrap.o opendata.o pdf.o PhotonFlux.o

pdg2pdf.o NNPDFDriver.o

gfortran -O -w -fbounds-check -fPIC -ffixed-

rw_para.o rw_para.f

kin_

END

1

Error: Expecting END FUNCTION statement at (1)

kin_

Error: Unexpected IMPLICIT NONE statement at (1)

kin_

double precision p1(0:3),p2(0:3), dsign

Error: Symbol 'p1' at (1) already has basic type of REAL

kin_

XY1 = sqrt((p1(

1

Error: Symbol 'xy1' at (1) has no IMPLICIT type

ranlib ../../lib/libpdf.a

make[1]: Leaving directory

`/home/

make: *** [kin_functions.o] Error 1

make: *** Waiting for unfinished jobs....

ar cru ../../lib/

rw_para.o model_functions.o couplings1.o couplings2.o couplings3.o

ranlib ../../lib/

make[1]: Leaving directory

`/home/

Please try to fix this compilations issue and retry.

Help might be found at https:/

If you think that this is a bug, you can report this at

https:/

quit

INFO:

Can you please check my mistake in kin_function.f and let me know.

Thanking you very much.

Regards,

Deepanjali

> Your question #280514 on MadGraph5_aMC@NLO changed:

> https:/

>

> Status: Open => Answered

>

> Rikkert Frederix proposed the following answer:

> Hello Deepanjali,

>

> XY1 should be defined in kin_functions.f. The placeholder is there.

>

> Anti-neutrinos can be treated in the same way is the neutrinos by adding

> them to the same class.

>

> Best,

> Rikkert

>

> --

> If this answers your question, please go to the following page to let us

> know that it is solved:

> https:/

>

> If you still need help, you can reply to this email or go to the

> following page to enter your feedback:

> https:/

>

> You received this question notification because you asked the question.

>

Rikkert Frederix (frederix) said : | #7 |

Dear Deepanjali,

The kin_function.f is a fortran77 file. You'll have to use syntax that is fortran77 compatible (including the 6 white spaces at the beginning of each line). Please look on-line for introductions to programming in fortran77.

Best,

Rikkert

Hi,

I checked that all the lines have 6 blank white space. Still showing the

same error.

Please give me suggestions over it.

Thanking you.

Regards,

Deepanjali

> Question #280514 on MadGraph5_aMC@NLO changed:

> https:/

>

> Status: Open => Answered

>

> Rikkert Frederix proposed the following answer:

> Dear Deepanjali,

>

> The kin_function.f is a fortran77 file. You'll have to use syntax that

> is fortran77 compatible (including the 6 white spaces at the beginning

> of each line). Please look on-line for introductions to programming in

> fortran77.

>

> Best,

> Rikkert

>

> --

> You received this question notification because you are subscribed to

> the question.

>

Hi,

If I'm correct it should be 7 space not 6.

including before the DOUBLE PRECISION FUNCTION XY1(P1,P2)

Otherwise this is pure computing, and it will be very difficult to help you via mail/internet (and not our role actually).

So if you still have problem, I would suggest to find a f77 expert within your collegue and/or ask your IT team for help on this.

Cheers,

Olivier

Hi,

Thank you very much.

It solved my problem.

Regards,

Deepanjali

> Question #280514 on MadGraph5_aMC@NLO changed:

> https:/

>

> Status: Open => Answered

>

> Olivier Mattelaer proposed the following answer:

> Hi,

>

> If I'm correct it should be 7 space not 6.

> including before the DOUBLE PRECISION FUNCTION XY1(P1,P2)

>

> Otherwise this is pure computing, and it will be very difficult to help

> you via mail/internet (and not our role actually).

> So if you still have problem, I would suggest to find a f77 expert within

> your collegue and/or ask your IT team for help on this.

>

> Cheers,

>

> Olivier

>

> --

> You received this question notification because you are subscribed to

> the question.

>

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